onfling() not being called for some reason

I'm trying to implement gesture in my app and for some reason the the onfling() is not being called. I tried reading numerous posts regarding this and tried fixing my code but it's not working . The below is my code. Please have a look:

public class MainMenuSlider extends Activity implements OnClickListener{

protected MyGestureListener myGestureListener;

private static final int SWIPE_MIN_DISTANCE = 120;
private static final int SWIPE_MAX_OFF_PATH = 250;
private static final int SWIPE_THRESHOLD_VELOCITY = 200;

private ViewFlipper vf;
private Animation animFlipInNext,animFlipOutNext, animFlipInPrevious, animFlipOutPrevious;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.mainmenuslider);
    myGestureListener = new MyGestureListener(this);

    //vf for viewflipper
    vf=(ViewFlipper)findViewById(R.id.ViewFlipper01);
    animFlipInNext = AnimationUtils.loadAnimation(this, R.anim.flipinnext);
    animFlipOutNext = AnimationUtils.loadAnimation(this, R.anim.flipoutnext);
    animFlipInPrevious = AnimationUtils.loadAnimation(this, R.anim.flipinprevious);
    animFlipOutPrevious = AnimationUtils.loadAnimation(this, R.anim.flipoutprevious);

    imageone = (ImageView) findViewById(R.id.imageone);
    imagetwo = (ImageView) findViewById(R.id.imagetwo);
    imageone.setOnClickListener(myGestureListener);
    imagetwo.setOnClickListener(myGestureListener);


} 


class MyGestureListener extends SimpleOnGestureListener implements OnTouchListener
    {
        Context context;
        GestureDetector gDetector;

    public MyGestureListener()
    {
        super();
    }

    public GestureDetector getDetector()
    {
        return gDetector;
    } 

    public MyGestureListener(Context context) 
    {
        this(context, null);
    }

    public MyGestureListener(Context context, GestureDetector gDetector) 
    {

        if(gDetector == null)
            gDetector = new GestureDe